Modems - General Installation Instructions

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Document ID: YAST-3GWPMR

Modems - General Installation Instructions

Applicable to: World-Wide

Contents:
Modem Installation in your IBM PC
Avoiding IRQ and COM Port Conflicts
Installing an Internal Modem in DOS
Installing an External Modem in DOS
Installing an Internal Modem in Windows 3.1
Installing an External Modem in Windows 3.1
Installing Your Modem in Windows 95
Installing an External Modem in Windows 95
Installing Your Modem in Windows NT 4.0.
Installing an External Modem in Windows NT4.0
Installing your Modem in OS/2
Installing an External Modem in OS/2

Modem Installation in your IBM PC:
Your first step in getting your modem up and running is to obtain and read the modem installation guide and other documents provided by the modem manufacturer. Reviewing these documents prior to installation is strongly recommended. Identifying the general type of modem you have is required.

Avoiding IRQ and COM Port Conflicts:
Any modem (or serial port for an external modem) requires its own unique system resources to function properly. One of these resources is the COM port number which is assigned to each active serial port or internal modem adapter, by the operating system on boot-up according to their base I/O address setting. Windows 95 will assign COM port 1-4 as shown in the table below. Other operating systems, such as OS/2, will assign only COM1 and COM2 by default.

Device set for I/O address 3F8 - Assigned as COM1
Device set for I/O address 2F8 - Assigned as COM2
Device set for I/O address 3E8 - Assigned as COM3
Device set for I/O address 2E8 - Assigned as COM4

This is where problems might arise. One should know what settings are being used by their system's built in serial ports (including infrared devices) in the system setup, to avoid conflicts between system settings the new device. It is easier to check this first than to guess wrong and subsequently "unravel" the problem. You will check for this in the next section "System Set Up". Before proceeding, you should review the following illustration of a typical action one would take to plan ahead for a new device.

Device

I/O Address

COM Port

Usage

Action

Reason

Serial Port

3F8

COM1

Serial Printer

Leave Enabled

Serial Port will be used by a Serial Printer

Infrared Port

2F8

COM2

Unused

Disable

Will allow new internal modem to use I/O address 2F8 and COM2

In this example, the ACTION column shows disabling an unused serial device so that your new internal modem won't conflict with the unused infrared device. The following steps will let you view and disable (as required) an unused system serial device to make way for your new modem.

System Set Up:
Perform the following steps to check what serial devices are enabled in your computer:
1. Power on the computer.
2. When a white square "book" appears in the upper right corner of the screen, press the F1 on your keyboard.
3. Use the DOWN ARROW and ENTER key on your keyboard to select The "System Summary" and "Devices and I/O Ports" sections. Disable any serial device you are not using. Use the ESCAPE key to back out of a menu panel.
4. Select "Save Settings" from the main system setup menu, then select EXIT.
5. Your system will now restart.

Standard Modem Settings:
You should plan to have your modem use one of the standard settings listed below for the best software compatibility even though your modem may support IRQ 2, 3, 4, 5 or 7. It important to make sure that no other device is configured to use the same IRQ and I/O address as your modem.

Serial 1

COM1

I/O 3F8h

IRQ 4

Serial 2

COM2

I/O 2F8h

IRQ 3

Serial 3

COM3

I/O 3E8h

IRQ 4

Serial 4

COM4

I/O 2E8h

IRQ 3*

*Avoid COM4 if possible as many video graphics systems share COM4's memory address. Note the following regarding the above table:

COM1 and COM4 share IRQ 4
COM2 and COM4 share IRQ 3.
IRQ "sharing" often leads to difficulty and is not recommended.

It is not recommended to configure, for example, a serial printer using COM1 and a modem using COM4. Each of these devices would expect to have IRQ 4 for it's own use. You would in this case, get an error message if you tried to use your modem when at the same instant your system (possibly without warning) attempts to access the printer to clear a print job.

Other common sources of conflict include a sound cards and network cards. You may have to "shuffle" the IRQ of an adapter card to make room for your new modem.

The default IRQ/Assignment table below illustrates which resources may be available should you need to change an adapter's IRQ resource. Your machine may have, for example, a Local Area Network card assigned to IRQ 5.

IRQ - Assignment
0 - System Timer
1 - Keyboard
2 - Cascade Input
3 - COM2
4 - COM1
5 - Available or Parallel Port 2 (LPT2)
6 - Diskette Controller (floppy drives)
7 - Parallel Port 1 (LPT1)
8 - Real-time Clock
9 - Available
10 - Available
11 - Available
12 - Mouse
13 - Math Coprocessor
14 - IDE Drive 0,1 (If installed)
15 - Available

Installing an Internal Modem in DOS:
You will need the following resources to use an internal modem:
-a residential telephone jack
-a phone cable (included with modem)

You should have already verified as available, or made available, one of the COM port, I/O address and IRQ combinations.
1. Set the modem jumpers to the appropriate COM port, I/O address and IRQ setting you selected in the earlier step. NOTE: ignore this step if your modem is a Plug and Play type, or is set only through a supplied setup program, ignore this step and proceed to the next.
2. Remove the cover from the IBM PC, using the instructions in your "Installing Options in Your Personal Computer" manual and follow the instructions in the "Installing and Removing Adapters" section of your manual to insert the modem into an available adapter slot.
3. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the phone jack marked "line in" on the rear of the modem adapter. If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.
4. Replace the cover of your computer.
5 Restart your computer.
6. The IBM PC should give a 162 POST error code indicating a new device has been installed in the system. The System Setup utility will appear. If it does not , you'll need to turn off the system and check the modem's jumper settings. The "System Summary" and "Devices and I/O Ports" sections should have arrows next to them indicating a new device has been added to the list of installed devices. Select these items and verify that the system sees your internal modem.
7. Select Save Settings from the Main System Setup Menu and then select EXIT.
8. Your modem should now be installed and connected to the phone line.

If your modem requires a software setup program to configure it to the appropriate COM port, I/O address and IRQ setting you should do so now. If your modem is a Plug and Play type it must be set through a supplied setup program or set as a legacy adapter as DOS does not recognize Plug and Play devices. If you do change your adapter setting at this point, you must restart your computer. If your system displays error 162, go back to the preceeding step pertaining to that error and proceed through again.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a DOS communication program. Be sure to configure your software to point to the correct COM port!

Installing an External Modem in DOS.
You will need the following resources to use an external modem:
-an AC electrical outlet
-a residential telephone jack
-an RS-232 communication cable for
-a phone cable and power cord (included with modem)

Follow these steps along with any additional your modem documentation requires:
1. Attach the power cord to the back of the modem then plug the AC plug into the AC outlet.
2. Switch the modem on to see if it operates, if the modem lights do not glow, contact the modem dealer or manufacturer for assistance.
3. Attach the communication cable to the rear of the modem then the other cable end to the serial port in the rear of your system.
4. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the rear of the modem marked "line in". If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a DOS communication program. Be sure to configure your software to point to the correct COM port!

Installing an Internal Modem in Windows 3.1:
You will need the following resources to use an internal modem:
-a residential telephone jack
-a phone cable (included with modem)

You should have already verified as available, or made available, one of the COM port, I/O address and IRQ combinations.
1. Set the modem jumpers to the appropriate COM port, I/O address and IRQ setting you selected in the earlier step. NOTE: ignore this step if your modem is a Plug and Play type, or is set only through a supplied setup program, ignore this step and proceed to the next.
2. Remove the cover from the IBM PC, using the instructions in your "Installing Options in Your Personal Computer" manual and follow the instructions in the "Installing and Removing Adapters" section of your manual to insert the modem into an available adapter slot.
3. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the phone jack marked "line in" on the rear of the modem adapter. If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.
4. Replace the cover of your computer.
5. Restart your computer.
6. The IBM PC should give a 162 POST error code indicating a new device has been installed in the system. The System Setup utility will appear. If it does not , you'll need to turn off the system and check the modem's jumper settings. The "System Summary" and "Devices and I/O Ports" sections should have arrows next to them indicating a new device has been added to the list of installed devices. Select these items and verify that the system sees your internal modem.
7. Select Save Settings from the Main System Setup Menu and then select EXIT.
8. Your modem should now be installed and connected to the phone line.

If your modem requires a software setup program to configure it to the appropriate COM port, I/O address and IRQ setting you should do so now. If your modem is a Plug and Play type it must be set through a supplied setup program or set as a legacy adapter as Windows 3.1 does not recognize Plug and Play devices. If you do change your adapter setting at this point, you must restart your computer. If your system displays error 162, go back to the preceeding step pertaining to that error and proceed through again.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a Windows communication program or the Terminal program in the Accessories group. Be sure to configure your software to point to the correct COM port!

Installing an External Modem in Windows 3.1:
You will need the following resources to use an external modem.
-an AC electrical outlet
-a residential telephone jack
-an RS-232 communication cable for
-a phone cable and power cord (included with modem)

At this point your modem should be powered on and connected to both the computer and the phone line and your are now ready to configure Windows.

If you have setup a new COM port in Windows you will need to specify the settings for the new COM port you added as they are not always detected by Windows. The Ports option in Control Panel provide the means to accomplish this.

1. In the Control Panel-Ports window, click the Advanced button.
2. Type in or select the new I/O address and IRQ value for your new COM port.
3. Close your Windows session, when you restart a Windows session, you will find Windows recognizes the new ports.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install Windows communication program or use Windows Terminal in the Accessories Group. Be sure to configure your software to point to the correct COM port!

Installing Your Modem in Windows 95:
You will need the following resources to use an internal modem:
-a residential telephone jack
-a phone cable (included with modem)

You should have already verified as available, or made available, one of the COM port, I/O address and IRQ combinations.
1. Set the modem jumpers to the appropriate COM port, I/O address and IRQ setting you selected in the earlier step. NOTE: ignore this step if your modem is a Plug and Play type, or is set only through a supplied setup program, ignore this step and proceed to the next.
2. Remove the cover from the IBM PC, using the instructions in your "Installing Options in Your Personal Computer" manual and follow the instructions in the "Installing and Removing Adapters" section of your manual to insert the modem into an available adapter slot.
3. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the phone jack marked "line in" on the rear of the modem adapter. If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.
4. Replace the cover of your computer.
5. Restart your computer.
6. The IBM PC should give a 162 POST error code indicating a new device has been installed in the system. The System Setup utility will appear. If it does not , you'll need to turn off the system and check the modem's jumper settings. The "System Summary" and "Devices and I/O Ports" sections should have arrows next to them indicating a new device has been added to the list of installed devices. Select these items and verify that the system sees your internal modem.
7. Select Save Settings from the Main System Setup Menu and then select EXIT.
8. Your modem should now be installed and connected to the phone line.

You are now ready to setup your modem in Windows 95.

A variety of factors will affect what Windows 95 does after it boots up the first time with a new modem installed. The following section lists some possible behavior. Now is a good time to review your modem documentation for Windows 95 installation now. If the modem manufacturer provided driver diskettes for Windows 95, keep them at hand.

Modem is detected automatically on startup, correct drivers are installed automatically.
-You may skip to the bottom paragraph if this is the case.

Modem is detected, but you are prompted to select which driver you want to install.
-Use a driver disk supplied by the manufacturer. Many modem manufacturers have updated drivers specific for Windows 95 and are available through their BBS services.
-Select from list of Windows 95 alternate drivers.
-If the manufacturer does not have a Windows 95 driver, ask what other modem that is in the Windows 95 driver list will work with your modem.
-Reinstall the modem with the identified driver.
-Do not install a driver at this time.

Modem is detected on startup, incorrect drivers are installed.
-Go to My Computer-Control Panel-Modems. Delete incorrect modem (if present). Click the add button to start the wizard, uncheck the "don't detect my modem" check box, click Next. Find your modem's manufacturer then click it to display the available models to select. Select your modem and follow the remaining instructions. If your modem is not on the list you have a few alternatives:
1. Use the Windows 95 modem driver disk supplied by the manufacturer.
2. Contact the manufacturer and ask for a driver disk. Reinstall the modem with the new driver.
3 Contact the manufacturer and ask what other modem that is in the Windows 95 driver list will work with your modem. -Reinstall the modem with the identified driver.
4. Do not install a driver at this time.

Modem is not detected when Windows 95 starts.
-Possible causes for this include:
1. Your modem won't be detected if it already appears in the My Computer-Control Panel-Modems list.
2. Your modem cable (external) is not attached to the modem or computer, check connection and turn off and on again.
3. Your internal modem is not configured properly, check the My Computer-Control Panel-System-Ports to see if it appears.
4. A software program is trying to access the modem or COM port. Disable or uninstall any offending program, per the program manufacturer, to proceed with installation.

Windows 95 should at this point have the correct (or compatible) modem driver copied to your hard drive or installed. Click "Finish" to complete the driver installation.

1. The next dialog box "Modems Properties" will allow you select "Dialing Properties" which prompt you for your country, area code, telephone access information, etc.. You to set up a dialing location, you may type in "Home" for example, then click new to create a location for home which retains a profile with information about your home telephone system, "Disable Call Forwarding" etc..
2. You may also click "Properties" for the new modem to verify the port, speed, etc. You should also click "Diagnostics" tab to have Windows 95 check your modem, or you may use the following methods:

You may now confirm the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a Windows 95 communication program or use Windows 95 HyperTerminal program in the Accessories folder. Be sure to configure your software to point to the correct COM port!

Installing an External Modem in Windows 95
You will need the following resources to use an external modem:
-an AC electrical outlet
-a residential telephone jack
-an RS-232 communication cable for
-a phone cable and power cord (included with modem)

At this point your modem should be powered on and connected to both the computer and the phone line and your are now ready to configure Windows.

A variety of factors will affect what Windows 95 does after it boots up the first time with a new modem installed. The following section lists some possible behaviour. Now is a good time to review your modem documentation for Windows 95 installation now. If the modem manufacturer provided driver diskettes for Windows 95, keep them at hand.

Modem is detected automatically on startup, correct drivers are installed automatically.
-You may skip to the bottom paragraph if this is the case.

Modem is detected, but you are prompted to select which driver you want to install.
-Use a driver disk supplied by the manufacturer.
-Many modem manufacturers have updated drivers specific for Windows 95 and are available through their BBS services.
-Select from list of Windows 95 alternate drivers.
-If the manufacturer does not have a Windows 95 driver, ask what other modem that is in the Windows 95 driver list will work with your modem.
-Reinstall the modem with the identified driver.
-Do not install a driver at this time.

Modem is detected on startup, incorrect drivers are installed.
-Go to My Computer-Control Panel-Modems. Delete incorrect modem (if present). Click the add button to start the wizard, uncheck the "don't detect my modem" check box, click Next. Find your modem's manufacturer then click it to display the available models to select. Select your modem and follow the remaining instructions. If your modem is not on the list you have a few alternatives:
1. Use the Windows 95 modem driver disk supplied by the manufacturer.
2. Contact the manufacturer and ask for a driver disk. Reinstall the modem with the new driver.
3. Contact the manufacturer and ask what other modem that is in the Windows 95 driver list will work with your modem. Reinstall the modem with the identified driver.
4. Do not install a driver at this time.

Windows 95 should at this point have the correct (or compatible) modem driver copied to your hard drive or installed. Click "Finish" to complete the driver installation.

You may now confirm the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command. .

You are now ready to install a Windows 95 communication program or use Windows 95 HyperTerminal program in the Accessories folder. Be sure to configure your software to point to the correct COM port!

Installing Your Modem in Windows NT 4.0.
You will need the following resources to use an internal modem:
-a residential telephone jack
-a phone cable (included with modem)

You should have already verified as available, or made available, one of the COM port, I/O address and IRQ combinations.
1. Set the modem jumpers to the appropriate COM port, I/O address and IRQ setting you selected in the earlier step. NOTE: ignore this step if your modem is a Plug and Play type, or is set only through a supplied setup program, ignore this step and proceed to the next.
2. Remove the cover from the IBM PC, using the instructions in your "Installing Options in Your Personal Computer" manual and follow the instructions in the "Installing and Removing Adapters" section of your manual to insert the modem into an available adapter slot.
3. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the phone jack marked "line in" on the rear of the modem adapter. If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.
4. Replace the cover of your computer.
5. Restart your computer.
6. The IBM PC should give a 162 POST error code indicating a new device has been installed in the system. The System Setup utility will appear. If it does not , you'll need to turn off the system and check the modem's jumper settings. The "System Summary" and "Devices and I/O Ports" sections should have arrows next to them indicating a new device has been added to the list of installed devices. Select these items and verify that the system sees your internal modem.
7. Select Save Settings from the Main System Setup Menu and then select EXIT.
8. Your modem should now be installed and connected to the phone line.

If your modem requires a software setup program to configure it to the appropriate COM port, I/O address and IRQ setting you should do so now. If your modem is a Plug and Play type it must be set through a supplied setup program or set as a legacy adapter as NT 4.0 does not recognize Plug and Play devices. If you do change your adapter setting at this point, you must restart your computer. If your system displays error 162, go back to the preceeding step pertaining to that error and proceed through again.

Complete the following steps to setup your modem in NT 4.0:
1. Double click "My Computer", then "Control Panel".
2 Double click "Ports", the "Ports" dialog box will appear.
3. Add new port or configure to appropriate I/O address, exit from dialog box.
4. Double click "Modems", the "Install New Modem" dialog box will appear. If your modem is on the NT Hardware Compatibility List, leave "Do not detect" unchecked. If your modem is not on the Compatibility List, or you have an updated modem driver diskette, skip the next step and proceed. You will be given the option to install a driver from diskette or to select an alternate driver from the list (check with your modem manufacturer for compatible modems supported by NT 4.0.
5. Click "Next", NT 4.0 will attempt to detect your modem type.
6. Verify that your modem is the correct type then click "Next".
7. The next dialog box will prompt you for your country, area code, maximum port speed (this may be set to the highest value), telephone access information, etc..
8. Click Next, the Dialing properties dialog box will prompt you to set up a dialing location, you may type in "Home" for example, then click new to create a location for home which retains a profile with information about your home telephone system, "Disable Call Forwarding" etc..
9. Your modem is now configured for NT 4.0 and ready to be checked out.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a Windows NT communication program or use HyperTerminal in the Accessories folder. Be sure to configure your software to point to the correct COM port!

Installing an External Modem in Windows NT4.0:
You will need the following resources to use an external modem:
-an AC electrical outlet
-a residential telephone jack
-an RS-232 communication cable for
-a phone cable and power cord (included with modem)

At this point your modem should be powered on and connected to both the computer and the phone line and your are now ready to configure Windows.

Complete the following steps to setup your modem in NT 4.0:
1. Double click "My Computer", then "Control Panel".
2. Double click "Ports", the "Ports" dialog box will appear.
3. Add new port or configure to appropriate I/O address, exit from dialog box.
4. Double click "Modems", the "Install New Modem" dialog box will appear. If your modem is on the NT Hardware Compatibility List, leave "Do not detect" unchecked. If your modem is not on the Compatibility List, or you have an updated modem driver diskette, skip the next step and proceed. You will be given the option to install a driver from diskette or to select an alternate driver from the list (check with your modem manufacturer for compatible modems supported by NT 4.0.
5. Click "Next", NT 4.0 will attempt to detect your modem type.
6. Verify that your modem is the correct type then click "Next".
7. The next dialog box will prompt you for your country, area code, maximum port speed (this may be set to the highest value), telephone access information, etc..
8. Click Next, the Dialing properties dialog box will prompt you to set up a dialing location, you may type in "Home" for example, then click new to create a location for home which retains a profile with information about your home telephone system, "Disable Call Forwarding" etc..
9. Your modem is now configured for NT 4.0 and ready to be checked out.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

You are now ready to install a Windows NT communication program or use HyperTerminal in the Accessories folder. Be sure to configure your software to point to the correct COM port!

Installing your Modem in OS/2:
You will need the following resources to use an internal modem:
-a residential telephone jack
-a phone cable (included with modem)

You should have already verified as available, or made available, one of the COM port, I/O address and IRQ combinations.

1. Set the modem jumpers to the appropriate COM port, I/O address and IRQ setting you selected in the earlier step. NOTE: ignore this step if your modem is a Plug and Play type, or is set only through a supplied setup program, ignore this step and proceed to the next.
2. Remove the cover from the IBM PC, using the instructions in your "Installing Options in Your Personal Computer" manual and follow the instructions in the "Installing and Removing Adapters" section of your manual to insert the modem into an available adapter slot.
3. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the phone jack marked "line in" on the rear of the modem adapter. If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.
4. Replace the cover of your computer.
5. Restart your computer.
6. The IBM PC should give a 162 POST error code indicating a new device has been installed in the system. The System Setup utility will appear. If it does not , you'll need to turn off the system and check the modem's jumper settings. The "System Summary" and "Devices and I/O Ports" sections should have arrows next to them indicating a new device has been added to the list of installed devices. Select these items and verify that the system sees your internal modem.
7. Select Save Settings from the Main System Setup Menu and then select EXIT.
8. Your modem should now be installed and connected to the phone line.

If your modem requires a software setup program to configure it to the appropriate COM port, I/O address and IRQ setting you should do so now. If your modem is a Plug and Play type it must be set through a supplied setup program or set as a legacy adapter as OS/2 does not recognize Plug and Play devices. If you do change your adapter setting at this point, you must restart your computer. If your system displays error 162, go back to the preceeding step pertaining to that error and proceed through again.

OS/2 Warp and 2.x is set by default to support COM1 and COM2 at the standard settings shown below. If your serial port / external modem or internal modem are set exactly as shown below, you don't need to change anything in OS/2.

COM1: I/OAddress 3F8h, IRQ 4
COM2: I/OAddress 2F8h, IRQ 3

To configure OS/2 to recognize COM3 and COM4, you will need to edit your CONFIG.SYS file as shown below. As always, it is recommended to stick to the standard settings as shown below when you configure your port or modem.

COM3: I/OAddress 3E8h, IRQ 4
COM4: I/OAddress 2E8h, IRQ 3

1. Type EPM in an OS/2 window to start the OS/2 editor.
2. Open the OS/2 CONFIG.SYS file located in the root directory.
3. Modify the line containing DEVICE=C:\OS2\BOOT\COM.SYS by adding new COM port information to the end of the line.

For example: to add COM3 you would change the line from: DEVICE=C:\OS2\BOOT\COM.SYS

To appear as: DEVICE=C:\OS2\BOOT\COM.SYS (3,3e8,5) The values in parenthesis represent the COM port number (3), the I/O address (3e8) and the IRQ (5). Additional help is available from an OS/2 command line by typing "HELP COM.SYS)

4. Save CONFIG.SYS in the editor.
5. Shutdown and restart the system, OS/2 will now recognize the COM port you added.

If you plan to use the new COM port in Windows session within OS/2, you will need to specify the settings for the new COM port you added as they are not always detected by Windows. The Ports option in Control Panel provide the means to accomplish this.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command

You are now ready to install an OS/2 or Windows communication program or use the included PMTerminal or Windows Terminal program in the Windows Accessories folder. Be sure to configure your software to point to the correct COM port!.

Installing an External Modem in OS/2:
You will need the following resources to use an external modem:
-an AC electrical outlet
-a residential telephone jack
-an RS-232 communication cable for
-a phone cable and power cord (included with modem)

Follow these steps along with any additional your modem documentation requires:

1. Attach the power cord to the back of the modem then plug the AC plug into the AC outlet.
2. Switch the modem on to see if it operates, if the modem lights do not glow, contact the modem dealer or manufacturer for assistance.
3. Attach the communication cable to the rear of the modem then the other cable end to the serial port in the rear of your system.
4. Plug the phone cable into the residential telephone jack, then plug the other end into a telephone to listen for a dial tone. If there is a dial tone, unplug the cord from the phone and into the rear of the modem marked "line in". If there is no dial tone, you should check your telephone, telephone cable, telephone jack and building telephone wiring out to the telephone company's junction box. Call your local phone service provider for assistance if needed.

COM1: I/OAddress 3F8h, IRQ 4
COM2: I/OAddress 2F8h, IRQ 3

COM3: I/OAddress 3E8h, IRQ 4
COM4: I/OAddress 2E8h, IRQ 3

For example: to add COM3 you would change the line from: DEVICE=C:\OS2\BOOT\COM.SYS

4. Save CONFIG.SYS in the editor.
5. Shutdown and restart the system, OS/2 will now recognize the COM port you added.

You may now verify the presence of your COM ports by using the DEBUG utility. You may also wish to verify the operation of your modem with the ECHO command.

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Modems, Hardware Installation/Configuration

Date Created

09-05-97

Last Updated

01-12-98

Revision Date

19-11-99

Brand

IBM Options

Product Family

Modems

Machine Type

2400, 9600, 14.4K, 19.2K, 28.8K, 33.6K, 56K, 128K, Accessory

Model

All

TypeModel

Retain Tip (if applicable)

Reverse Doclinks
and Admin Purposes

Device	I/O Address	COM Port	Usage	Action	Reason
Serial Port	3F8	COM1	Serial Printer	Leave Enabled	Serial Port will be used by a Serial Printer
Infrared Port	2F8	COM2	Unused	Disable	Will allow new internal modem to use I/O address 2F8 and COM2

Serial 1	COM1	I/O 3F8h	IRQ 4
Serial 2	COM2	I/O 2F8h	IRQ 3
Serial 3	COM3	I/O 3E8h	IRQ 4
Serial 4	COM4	I/O 2E8h	IRQ 3*

	Search Keywords
	Hint Category	Modems, Hardware Installation/Configuration
	Date Created	09-05-97
	Last Updated	01-12-98
	Revision Date	19-11-99
	Brand	IBM Options
	Product Family	Modems
	Machine Type	2400, 9600, 14.4K, 19.2K, 28.8K, 33.6K, 56K, 128K, Accessory
	Model	All
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes